O-72-53ORDINANCE NO. 0 -72- 53
AN ORDINANCE AMENDING ARTICLE III OF CHAPTER 24
OF THE MUNICIPAL CODE OF DEERFIELD
BY ADDING A NEW SECTION 24.322
BE IT ORDAINED BY THE PRESIDENT AND BOARD OF TRUSTEES OF THE
VILLAGE OF DEERFIELD, LAKE AND COOK COUNTIES, ILLINOIS, AS FOLLOWS:
SECTION That Article III of Chapter 24 of the Municipal Code of
ONE: Deerfield of 1963, as amended, be and the same is hereby
further amended by adding a new Section 24.322, entitled
"Storm Water Detention" thereto.
1124.322 Storm Water Detention.)
"(a) A combination of storage and controlled release of
storm water runoff shall be required for all commercial -
industrial developments of one. acre or more in area, for all
multiple - family residential developments of two or more acres
in area, and for all single-family developments of five acres or
more in area.,
"(b) The release rate of storm water from all developments
requiring detention shall not exceed the storm water runoff
rate from the area in its natural undeveloped state. A re-
lease rate of not greater than that calculated from a storm of
three (3) years frequency with a runoff rate coefficient of
0.15 will be acceptable unless the applicant can show by
detailed calculations which are acceptable to, the Village
Engineer that the discharge rate of the natural outlet' -
channel serving the area is greater.
"(c) Storm sewer systems shall have adequate capacity to
bypass through the development the flow from all upstream
areas for a storm of design frequency assuming that the land is in
a fully developed state under present zoning or zoning proposed under
the Village's Comprehensive Plan. The bypass flow rate shall be
computed utilizing a runoff coefficient of not less than 0.35. An
allowance, equivalent to the reduction in flow rate provided,
will be made for upstream detention when such upstream detention
and release rate has previously been approved by the Village and
has been constructed.
I
"(d) The live detention storage to be provided shall be
calculated on the basis of the 100 -year frequency rainfall,
as published by the U. S. Weather Bureau for this area.
The detention volume required shall be that necessary to
temporarily store the runoff of a 100 -year rainfall, for any
and all durations, from the fully developed drainage area
tributary to the reservoir, less that volume discharged during
the same duration at the approved release rate.
"(e) In the event the downstream sewers are inadequate to
receive the release rate hereinabove provided, then the
allowable release rate shall be reduced to that rate permitted
by the receiving downstream sewers and additional detention
as determined by the Village Engineer shall be required to
store that portion of the runoff exceeding the capacity of the
receiving sewers."
"(f) Plans, specificiations and calculations for storm water
detention facilities as required hereunder, shall be submitted
to the Village Engineer for approval prior to the commencement
of construction.
SECTION That all ordinances or parts of ordinances in conflict herewith
TWO: are, to the extent of such conflict, hereby repealed.
SECTION That the Village Clerk is hereby directed to publish
THREE: this Ordinance in pamphlet form.
SECTION That this Ordinance shall be in full force and effect
FOUR: from and after its passage, approval and publication,
as provided by law.
AYES: THREE (3) PASS: ONE (1) TOTAL: FOUR (4 )
NAYS: ONE (1)
ABSENT: ONE (1)
PASSED THIS -18th day of September , A.D. 19%2.
APPROVED THIS 18th day of September , A.D. 1972.
ATTEST:
VILLAGE —PRESIDENT
VILLAGE CLERK
j I
STATE OF ILLINOIS )
COUNTIES OF LAKE AND COOK ) SS
VILLAGE OF DEERFIELD )
The undersigned hereby certifies that she is the duly elected and
acting Village Clerk of the Village of Deerfield, Lake and Cook Counties,
Illinois, and that the foregoing is a true and accurate copy of an ordin
ance entitled "AN ORDINANCE AMENDING ARTICLE III OF CHAPTER 24 OF THE
MUNICIPAL CODE OF DEERFIELD BY ADDING A NEW SECTION 24.322 ", passed by
the President and Board of Trustees of the said Village at a regular meeting
thereof on the 18th day of September, 1972, all as appears in the records
and files of my office.
Dated this 20th day of September, 1972.
SEAL
Catherine B. Price
Village Clerk